Goldfish with other fish??

Coradee

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Common goldfish can get 18" or more & are not tropical fish, keeping them in high temperature can shorten their lifespan, imo they're best kept in a pond
 

Reyes

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Exactly, you will be mixing cold water with tropical fish. On top of that, 20g is not enough for 1 fancy Goldfish, let alone a Common.
 

Anders247

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Besides what's been mentioned about goldfish, lyretail mollies should have at least a 30g.....
 

CindiL

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Besides whats already been said, goldfish as they grow will try and eat anything that will fit into their mouths including guppies. They're best with their own kind
 

Dom90

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Besides what's been mentioned about goldfish, lyretail mollies should have at least a 30g.....
Although 5 lyretail mollies would make a 30g WAY overstocked, in terms of bioload, so he would need an even bigger tank in this case.
 

CindiL

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Although 5 lyretail mollies would make a 30g WAY overstocked, in terms of bioload, so he would need an even bigger tank in this case.
Hmmm, I have four lyretails and many other fish in my 33 long but my plants take care of the bio-load so I guess some of that will depend on the setup. Lyretails aren't big like balloons. They get up to around 4" max long though like any other molly. Its funny because AQ Advisor only shows me at 80% stocked with my fish (below in my sig).

Are you thinking of sailfin mollies maybe?
 

CindiL

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Yea that's probably it. But the average person wont have the amount of plants you have, or the nitrate land plants, so they'd probably be overstocked.
Well thats true about the plants! You'd laugh if you saw my 10g with the 50 or so molly fry. Some are about an inch now so I'm going to see about taking them to the local pet store this weekend.
 
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